Re: [Caml-list] detecting 32/64 bit from C

["Markus Weißmann" <markus.weissmann@in.tum.de>]

Perfect -- thanks a lot!

-Markus

On 2015-10-13 16:07, Gerd Stolpmann wrote:
> Am Dienstag, den 13.10.2015, 14:24 +0200 schrieb Adrien Nader:
>> On Tue, Oct 13, 2015, Markus Weißmann wrote:
>> > Hello,
>> >
>> > is there some "official" way to detect -- from C -- if OCaml was
>> > compiled for 32 or 64 bit?
>> > I'd love to have something like a #define that either says 32 or 
>> 64
>> > bit;
>> > I need to know at compile time if the OCaml system uses 31 or 63 
>> bit
>> > sized integers (in the C code).
>> > I don't care what the underlying OS or hardware does, but just 
>> what
>> > OCaml is using.
>> >
>> > Btw.: Is [Sys.word_size = 32] for 32 bit OCaml compilers on 64 bit
>> > machines?
>
> Yes.
>
>>
>> Hi,
>>
>> I believe config.h has the info you want:
>>   #define ARCH_SIXTYFOUR // for instance
>
> Exactly.
>
>> Note how it's installed under $(libdir) and not $(includedir): its
>> content is set at configure-time and depends on the architecture 
>> that
>> ocaml has been configured for.
>
> config.h should be available in $stdlib/caml. It is included from the
> other header files.
>
> Gerd
>
>> --
>> Adrien Nader
>>

-- 
Markus Weißmann, M.Sc.
Technische Universität München
Institut für Informatik
Boltzmannstr. 3
D-85748 Garching
Germany
http://wwwknoll.in.tum.de/